CN211834362U - Piezoelectric type intelligent medical watch - Google Patents

Abstract

The embodiment of the utility model discloses piezoelectric type intelligence medical treatment watch, the watch is in including winding the wrist strap at measurand position with carrying on pulse monitor on the wrist strap, pulse monitor includes: a power supply module; the pulse acquisition module can detect pulse signals passing through the measured part; the pulse conditioning module is electrically connected with the pulse acquisition module, and is used for amplifying and filtering the pulse signals and transmitting the amplified and filtered pulse signals to the main control chip; the main control chip is electrically connected with the pulse conditioning module and used for carrying out signal conversion on the pulse signals, acquiring pulse information and transmitting the pulse information to the wireless communication module and the display module; and the wireless communication module is electrically connected with the main control chip and transmits the pulse signals to the upper computer and the display module electrically connected with the wireless communication module. The utility model discloses the technique is reliable stable, and has improved pulse monitoring devices's practicality and convenience.

Description

Piezoelectric type intelligent medical watch

Technical Field

The utility model relates to a pulse monitoring technology field especially relates to a can carry out piezoelectric type intelligent medical treatment watch monitored to the healthy of person of wearing in real time.

Background

There are many devices related to detecting pulse signals, and the devices can be mainly divided into a piezoelectric type, a piezoresistive type, a photoelectric type and the like according to the signal acquisition mode. The piezoelectric type and the piezoresistive type convert the pressure process of pulse pulsation into signals through micro-pressure type materials (piezoelectric sheets, bridges and the like) and output and detect the signals. The photoelectric pulse sensor converts the change of the light transmittance of the blood vessel in the pulse beating process into a signal to be output and detected in a reflection or correlation mode. If the existing pulse measuring instrument is designed, an infrared photoelectric sensor is used for generating pulse signals, and the pulse signals are amplified and shaped and then input into a single chip microcomputer for corresponding control, so that the pulse beating times within one minute are measured; the pulse measuring instrument can supply the user to measure the pulse number of times at that time, can set for the upper and lower limit number of times, then drive bee calling organ warning when the measuring scope exceeds the setting value and remind, except that the user can also set for the alarm clock in addition and remind the measurement, the pulse signal that the result was finally gathered shows on LCD1602, but above-mentioned technique has following problem:

at present, the existing pulse monitor is inconvenient to carry and cannot monitor the own physical condition anytime and anywhere, and if the adopted pulse acquisition sensor is a photoelectric pulse sensor, the photoelectric pulse sensor is only suitable for fingertip detection and is not suitable for being installed on a wristwatch and limits the further development of the wristwatch due to the characteristic that pulse signals are easily interfered by the outside. Even if the piezoresistive sensor is adopted for pulse signal detection, the problem of inaccurate detection signals also exists, namely, the hardware circuit design of the conventional equipment capable of monitoring the body health of a wearer in real time, particularly the hardware circuit design of pulse signal acquisition correction and the like of wristwatch monitoring equipment is not complete, and the acquired pulse signals cannot be guaranteed not to be distorted.

Disclosure of Invention

Based on this, in order to solve the shortcoming that exists at prior art, especially provided a piezoelectric type intelligent medical treatment watch.

A piezoelectric type intelligent medical wrist watch, which comprises a wrist strap wound on a measured part and a pulse monitor carried on the wrist strap, wherein the pulse monitor comprises:

a power supply module;

the pulse acquisition module can detect pulse signals passing through the measured part;

the pulse conditioning module is electrically connected with the pulse acquisition module, and is used for amplifying and filtering the pulse signals and transmitting the amplified and filtered pulse signals to the main control chip;

the main control chip is electrically connected with the pulse conditioning module and used for carrying out signal conversion on the pulse signals, acquiring pulse information and transmitting the pulse information to the wireless communication module and the display module;

the wireless communication module is electrically connected with the main control chip and transmits the pulse signal to an upper computer;

and the display module is electrically connected with the wireless communication module and is used for displaying the pulse information of the pulse signals.

Optionally, in one embodiment, the pulse conditioning module includes: the filter circuit, the voltage boosting circuit and the amplifying circuit are electrically connected in sequence; the filter circuit is electrically connected with the pulse acquisition module, and the filter circuit performs noise reduction and compression processing on the AD sampling signal converted by the AD converter and then transmits the AD sampling signal to the voltage boosting circuit; the voltage boosting circuit is electrically connected with the filter circuit, and the voltage boosting circuit boosts a voltage signal of the AD sampling signal and then transmits the voltage signal to the amplifying circuit so as to amplify the signal gain of the signal.

Optionally, in one embodiment, the filter circuit employs a band-pass filter.

Optionally, in one embodiment, the band-pass filter includes a low-pass filter and a high-pass filter cascaded with the low-pass filter.

Optionally, in one embodiment, the low-pass filter and the high-pass filter cascaded with the low-pass filter both use a second-order active filter.

Optionally, in one embodiment, all operational amplifiers used in the pulse conditioning module employ TL084 elements.

Optionally, in one embodiment, the pulse acquisition module employs a piezoelectric pulse sensor.

Optionally, in one embodiment, the main control chip is an STM32F101C8T6 chip.

Optionally, in one embodiment, the display module is an OLED display module.

Optionally, in one embodiment, the wireless communication module is a bluetooth communication module.

Implement the embodiment of the utility model provides a, will have following beneficial effect:

(1) the utility model adopts a portable wristwatch structure to overcome the problems that the existing pulse monitor is inconvenient to carry and cannot monitor the body condition of the user at any time and any place;

(2) the utility model uses the piezoelectric pulse sensor, which can detect the frequency, rhythm, shape and filling degree of the pulse, while the conventional photoelectric pulse sensor is only suitable for detecting through the finger tip, and is not suitable for being installed on the wristwatch, therefore, the piezoelectric pulse sensor has high signal-to-noise ratio, simple structure and high sensitivity compared with the photoelectric pulse sensor, and the data collected by the photoelectric sensor more conforms to the pulse-taking principle of traditional Chinese medicine;

(3) the utility model adds a pulse signal conditioning circuit to overcome the characteristic that the pulse signal is easy to be interfered by the outside world, thereby ensuring that the sampling signal is not distorted;

(4) the utility model discloses a wireless communication mode, accessible bluetooth module transmission data to host computer or cell-phone to pass back this watch with the result of host computer or cell-phone APP analysis.

(5) The utility model discloses can also upload data to high in the clouds server through bluetooth module, utilize artificial intelligence algorithm such as the degree of depth study on the high in the clouds server to carry out the analysis with the pulse signal who gathers, have more the reliability to the diagnosis of disease.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Wherein:

FIG. 1 is a structural frame diagram of a piezoelectric smart medical wristwatch in an embodiment;

FIG. 2 is a schematic circuit diagram of a pulse conditioning module according to an embodiment;

FIG. 3 is a schematic circuit diagram of a multiple feedback second-order active low pass filter in one embodiment;

FIG. 4 is a schematic circuit diagram of a multiple feedback second order active high pass filter in one embodiment;

FIG. 5 is a circuit schematic of a voltage boost circuit in one embodiment;

FIG. 6 is a circuit schematic of an amplification circuit in one embodiment;

FIG. 7 is a circuit schematic diagram of the master control chip STM32F101C8T6 and peripheral circuits in one embodiment;

FIG. 8 is a circuit schematic of a Bluetooth module in one embodiment;

fig. 9 is a schematic circuit diagram of an OLED display module in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.

In order to overcome the defects in the prior art, the embodiment of the present invention particularly provides a piezoelectric intelligent medical wristwatch capable of monitoring a human body pulse signal in real time, for example, monitoring the condition of cardiovascular and cerebrovascular diseases related to arteriosclerosis of a human body, so as to assist people to timely find diseases through simple and noninvasive pulse fluctuation monitoring, thereby performing early prevention and treatment, and greatly reducing the incidence rate and treatment difficulty of the cardiovascular and cerebrovascular diseases. As shown in fig. 1, the wristwatch includes a wrist band around which a measurement site is wound, and a pulse monitor mounted on the wrist band, and the pulse monitor includes: a power supply module; the pulse acquisition module can detect pulse signals passing through the measured part; the pulse conditioning module is electrically connected with the pulse acquisition module, and is used for amplifying and filtering the pulse signals and transmitting the amplified and filtered pulse signals to the main control chip; the main control chip is electrically connected with the pulse conditioning module and used for carrying out signal conversion on the pulse signals, acquiring pulse information and transmitting the pulse information to the wireless communication module and the display module; the wireless communication module is electrically connected with the main control chip, the wireless communication module transmits the pulse signals to the upper computer and the display module, the wireless communication module is electrically connected with the wireless communication module, and the display module is used for displaying the pulse information of the pulse signals. The pulse monitor can be integrally developed on a circuit development board, wherein the pulse conditioning module can comprise circuits such as a band-pass filter circuit, an amplifying circuit, an A/D (analog/digital) conversion circuit and the like, pulse information such as pulse rate and pulse waveform obtained by the main control chip is displayed on a wristwatch screen through the display module, and data are transmitted to an upper computer or a mobile phone through Bluetooth; meanwhile, the analysis results of the upper computer or the mobile phone APP, namely the health degree, the arteriosclerosis degree and the hidden danger of diseases, can be transmitted back to the wristwatch.

In a specific embodiment 1, based on the above design principle, the pulse monitor in this embodiment is composed of a main control chip STM32F101C8T6, a pulse acquisition module, i.e., a piezoelectric pulse sensor, a pulse signal conditioning module, a bluetooth communication module, and an OLED display module. As shown in fig. 2-6, the pulse signal conditioning module includes a filter circuit, a voltage boosting circuit and an amplifying circuit, which are electrically connected in sequence; the filter circuit is electrically connected with the pulse acquisition module, and the filter circuit performs noise reduction and compression processing on the AD sampling signal converted by the AD converter and then transmits the AD sampling signal to the voltage boosting circuit; the voltage boosting circuit is electrically connected with the filter circuit, and the voltage boosting circuit boosts a voltage signal of the AD sampling signal and then transmits the voltage signal to the amplifying circuit so as to amplify the signal gain of the signal; the signal after the regulation is right by STM32 singlechip the pulse signal carries out signal conversion and obtains pulse information, and pulse information is shown in the rethread display screen display, like the wave form, or gives host computer or cell-phone APP with signal transmission through bluetooth module. The pulse signal conditioning module is arranged because the pulse pressure signal extracted by the pulse sensor has small amplitude, low frequency, strong randomness and easy interference, so when a hardware circuit is selected, the aspects of gain, frequency response, common mode rejection ratio, noise, drift and the like need to be comprehensively considered.

In the specific embodiment 2, in terms of frequency response, since the frequency spectrum range of the human pulse signal is 0.1 to 40Hz, the pulse signal conditioning circuit must amplify the detected pulse signal without distortion in the frequency range, i.e. in order to reduce the unnecessary out-of-band noise, a high-pass filter and a low-pass filter can be used to compress the pass band to realize that the pulse signal passing through the pulse signal conditioning circuit has a reliable diagnostic value. In the present case therefore, it is preferred that,the filter circuit adopts a band-pass filter consisting of a low-pass filter and a high-pass filter cascaded with the low-pass filter, for example, the filter circuit is realized by a method of cascading the low-pass filter of 44Hz with a high-pass filter of 0.1 Hz; meanwhile, in order to reduce the sensitivity of the elements and obtain better high-frequency attenuation characteristics and distortion characteristics, a multiple feedback type second-order active filter can be adopted, and the specific filter circuit structure of the multiple feedback type second-order active filter is shown in fig. 3 and 4. In the aspect of improving signal gain, because the output range of the piezoelectric pulse sensor is about-0.2-0.8V, in order to improve the resolution of the signals after AD sampling, the signals should be properly amplified, and the amplification factor of the pulse signal amplifier should be adjustable within 10 times according to the selected input reference voltage range of the AD converter, for example, the reference voltage range is 0-3.3V. Because all gains for amplifying pulse signals need to be provided by the amplifying circuit, in order to properly amplify pulse signals in different input ranges, the amplifier is designed to be adjustable within 11 times of gain, and the gain G-RW₁+ R13/R12, the circuit structure of the complete amplifying circuit is shown in FIG. 6. Meanwhile, the problem of common mode rejection ratio can be considered, namely the detection of the pulse signal can be interfered by a plurality of electric devices on the spot during operation, especially the common mode interference of the mains supply, and other common mode interferences. Therefore, CMMR may be required to reach over 80 dB. In a more specific embodiment, in the pulse signal conditioning circuit, noise and drift are two more important parameters, that is, noise during the operation of the signal conditioning circuit is mainly represented by intrinsic thermal noise and shot noise of an electronic circuit, which belong to white noise, and the amplitudes of the noise and the shot noise are normally distributed, so that in order to obtain an output signal with a certain signal-to-noise ratio, strict requirements are imposed on the low noise performance of an amplifier used, so that a low noise element should be selected as much as possible when designing the pulse signal conditioning circuit to reduce noise and further increase input impedance, and therefore, TL084 elements are used for all operational amplifiers used by the pulse conditioning module in this example.

In a specific embodiment 3, the pulse acquisition module employs a piezoelectric pulse sensor. The piezoelectric pulse sensor made of PVDF (polyvinylidene fluoride) is a soft-contact noninvasive pulse sensor and has the advantages of (1) large piezoelectric constant and high sensitivity. The piezoelectric constant g is 174, which is 10 times higher than that of quartz; (2) the membrane is light, has good flexibility and is easy to produce and prepare, and the processed membrane can be tightly attached to the skin, so that the pulse wave can pass through the membrane without distortion; (3) higher output power can be obtained. And (4) the mechanical quality factor is low, the density is low, the damping is small, the broadband characteristic is realized, and the frequency characteristic of the pulse signal can be just met.

In a specific embodiment 4, the main control chip adopts an STM32F101C8T6 chip; the wireless communication module adopts a Bluetooth communication module, as shown in figures 7-8. The working principle between the STM32F101C8T6 chip and the Bluetooth communication module is that pins PA9 and PA10 on the STM32F101C8T6 chip are connected with HC-05. Meanwhile, the mobile phone can be connected with HC-05 through Bluetooth; the bluetooth module has two working modes: a command response mode of operation and an automatic connection mode of operation; under the automatic connection working mode, the module can be divided into three working roles of a master role, a slave role and a loop; when the module is in an automatic connection working mode, data which are automatically connected according to a preset mode are transmitted; when the module is in the command response working mode, the AT command can be executed, and a user can send various AT commands to the module to set control parameters for the module or issue the control command; specifically, there are two methods for a module to enter a command response mode: the module is electrified, the AT mode is realized under the condition of no pairing, the baud rate is the baud rate of the module, and the default is as follows: 9600, PIO11 needs to be set high once when an AT command is sent once; after the PIO11 is set to be AT a high level, the module is powered on, the module enters an AT mode AT the moment, and the Baud rate is fixed as follows: 38400, the AT command may be sent directly. Since the communication between the STM32F101C8T6 chip and the bluetooth communication module is a conventional technology, a technician can set or change the communication according to actual requirements, and therefore the present embodiment briefly describes the principle.

In a specific embodiment 5, the display module is an OLED display module, as shown in fig. 9. The working principle between the STM32F101C8T6 chip and the OLED module is that the TM32F101C8T6 chip firstly sends a start signal and then sends a slave address, the first 7 bits of the slave address of the OLED module are addresses, and the last bit represents reading (1) or writing (0); and the acknowledge ACK signal indicates the presence of this slave device; upon receiving the response signal, a control bit is transmitted to distinguish whether the data transmitted thereafter is a control command or display-related data. While waiting for a reply signal after sending the control bit. Then sending corresponding control command or data; and finally, sending a stop signal to indicate that the data transmission is finished. Since the communication between the STM32F101C8T6 chip and the OLED display module is a conventional technology, a technician can set or change the chip according to actual needs, and therefore the present embodiment provides a brief description of the principle.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (6)

1. A piezoelectric type intelligent medical wrist watch, which comprises a wrist strap wound on a measured part and a pulse monitor carried on the wrist strap, wherein the pulse monitor comprises:

a power supply module;

the pulse acquisition module can detect pulse signals passing through the measured part;

the pulse conditioning module is electrically connected with the pulse acquisition module, and is used for amplifying and filtering the pulse signals and transmitting the amplified and filtered pulse signals to the main control chip; the pulse conditioning module comprises: the filter circuit, the voltage boosting circuit and the amplifying circuit are electrically connected in sequence; the filter circuit is electrically connected with the pulse acquisition module, and the filter circuit performs noise reduction and compression processing on the AD sampling signal converted by the AD converter and then transmits the AD sampling signal to the voltage boosting circuit; the voltage boosting circuit is electrically connected with the filter circuit, and the voltage boosting circuit boosts a voltage signal of the AD sampling signal and then transmits the voltage signal to the amplifying circuit so as to amplify the signal gain of the signal; the filter circuit adopts a band-pass filter; the band-pass filter comprises a low-pass filter and a high-pass filter cascaded with the low-pass filter; the low-pass filter and the high-pass filter cascaded with the low-pass filter both adopt second-order active filters;

the main control chip is electrically connected with the pulse conditioning module and used for carrying out signal conversion on the pulse signals, acquiring pulse information and transmitting the pulse information to the wireless communication module and the display module;

the wireless communication module is electrically connected with the main control chip and transmits the pulse signal to an upper computer;

and the display module is electrically connected with the wireless communication module and is used for displaying the pulse information of the pulse signals.

2. The piezoelectric intelligent medical wristwatch of claim 1, wherein all operational amplifiers used by the pulse conditioning module are TL084 elements.

3. The piezoelectric intelligent medical wristwatch of claim 1, wherein the pulse acquisition module employs a piezoelectric pulse sensor.

4. The piezoelectric intelligent medical wristwatch of claim 1, wherein the master control chip is an STM32F101C8T6 chip.

5. The piezoelectric intelligent medical wristwatch of claim 1, wherein the display module is an OLED display module.

6. The piezoelectric intelligent medical wristwatch of claim 1, wherein the wireless communication module is a bluetooth communication module.

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